|Publication number||US5476358 A|
|Application number||US 08/343,136|
|Publication date||Dec 19, 1995|
|Filing date||Nov 22, 1994|
|Priority date||May 22, 1992|
|Publication number||08343136, 343136, US 5476358 A, US 5476358A, US-A-5476358, US5476358 A, US5476358A|
|Inventors||Larry J. Costa|
|Original Assignee||Costa; Larry J.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (32), Classifications (12), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a continuation of application Ser. No. 07/887,317 filed on May 22, 1992, now abandoned.
This invention relates to a Cartesian robot and more particularly to a three-axis Cartesian robot.
Many types of robotic designs have been previously provided but they all suffer from one or more shortcomings. To the best of applicant's knowledge, the prior Cartesian robot devices required one drive motor for each axis of movement.
It is therefore a principal object of the invention to provide a three-axis Cartesian robot design.
Yet another object of the invention is to provide a three-axis Cartesian robot requiring only one axis of drive motion for the three axes of movement.
Still another object of the invention is to provide a three-axis Cartesian robot which is economical to manufacture, durable in use and refined in appearance.
These and other objects will be apparent to those skilled in the art.
FIG. 1 is a perspective view of the robot of this invention;
FIG. 2 is a top elevational view of a portion of the robot of this invention;
FIG. 3 is a side view of the drive mechanism for the robot of this invention;
FIG. 4 is a sectional view seen on lines 4--4 of FIG. 2; and
FIG. 5 is a right side view of the invention.
A three-axis Cartesian robot is described which includes a single drive motor for driving the robot in three directions of movement, namely the X, Y and Z axes.
The robot of this invention includes a first horizontally disposed support having a first carriage longitudinally movably mounted thereon. A drive motor is mounted on the first support and is operatively connected to the first carriage for moving the carriage longitudinally therealong. A second support is operatively secured to the first support and extends transversely therefrom adjacent one end thereof. A second carriage is selectively mounted on the second support. A third support is vertically movably mounted on the second carriage and has means at the lower end thereof for manipulating the workpieces. A traverse brake is provided for selectively preventing the movement of the first carriage at time. Similarly, a vertical brake is mounted on the second carriage as is a horizontal brake. Selective actuation of the traverse brake causes the second support to be moved relative to the first support. Selective actuation of the vertical brake causes selective vertical movement of the third support relative to the second carriage. Selective actuation of the horizontal brake causes the selective movement of the second carriage relative to the second support.
The design of the system consists of two or more axes of motion with only a single drive mechanism. Increased safety of this system is provided through the use of the horizontal brake, vertical brake and traverse brake. The robot of this invention is less complicated and is less expensive than the prior art devices.
Referring to FIG. 1, the numeral 10 refers to the three-axis Cartesian robot of this invention. Robot 10 includes a first support 12 which is horizontally disposed and which has opposite ends 14 and 16. Support 12 includes an upwardly presented dovetail design 18 upon which is movably mounted carriage 20.
Reversible drive motor 22 is mounted on support 12 adjacent end 14 and has a horizontally disposed drive shaft 24 extending therefrom. Sprocket or pulley 26 is mounted on drive shaft 24 and has belt or chain 28 extending therearound. As seen in FIG. 1, pulley 30 is rotatably mounted on bracket 32 and engages the upper portion of belt 28. Idler pulley 34 is rotatably mounted on support 12 adjacent end 16 and has the belt 28 extending therearound as seen in FIG. 1. Idler pulley 36 is also provided and has the belt 28 extending therearound as also seen in FIG. 1. Support 38 is mounted on carriage 20 and has shaft 40 mounted thereon. Pulley 42 is mounted on shaft 40 and also has the belt 28 extending thereon as also best seen in FIG. 1.
The inner end of shaft 40 has a bevel gear 43 mounted thereon which is in mesh with a bevel gear 44 mounted on shaft 46 so as to provide a right angle drive from drive motor 22. Pulley 48 is mounted on shaft 46 and has the belt 50 extending therearound.
Traverse brake 52 is operatively secured to the support means 12 and is interconnected to the block member 54 which is operatively connected to the carriage 20 so that when the brake 52 is actuated, carriage 20 will be pulled laterally towards support 12 to create frictional contact between carriage 20 and dovetail design 18 of support 12 to prevent movement of carriage 20 with respect to support 12.
A horizontally disposed support 56 extends transversely from the end of support 12 and has carriage 58 selectively horizontally movably mounted thereon. Pulley 60 is mounted at the outer end of support 56 and has belt 50 extending thereon as seen in FIG. 1.
As stated, carriage 58 is horizontally movably mounted on support 56. Carriage pulleys 62 and 64 are rotatably mounted on carriage 58 above the rotational axes of pulleys 48 and 60 and have the belt 50 extending therebeneath and therearound as seen in FIG. 5. Carriage idler pulleys 66 and 68 are rotatably mounted at the upper end of vertically disposed support 70 mounted on carriage 58. Carriage pulleys 72 and 74 are rotatably mounted on the carriage 58 below the rotational axes of pulleys 48 and 60 as seen in FIG. 5 and have the belt 50 extending thereover and therearound as also seen in FIG. 5. Pulleys 76 and 78 are rotatably mounted at the lower end of support 70 and have the belt 50 extending therearound.
Vertical brake 80 is mounted on carriage 58 as seen in FIG. 5 and comprises a hydraulic or pneumatic cylinder adapted to engage belt 50 to prevent movement of belt 50 as required. Anchor brake 82 is mounted on carriage 58 and is comprised of a hydraulic or pneumatic cylinder adapted to engage belt 50 to prevent movement of the belt 50 as required. Similarly, horizontal brake 84 is mounted on carriage 58 and it comprises a hydraulic or pneumatic cylinder arrangement adapted to grasp belt 50 to prevent movement of belt 50 as required. The lower end of support means 70 would include the necessary components positioned thereon to grasp or move the workpieces being manipulated.
In operation, support 56 may be moved longitudinally with respect to support 12 by disengaging traverse brake 52. When motor 22 is rotated in a counterclockwise direction as viewed in FIG. 1, support 56 will be moved towards the right as viewed in FIG. 1. When support 56 has been properly positioned by the motor 22, traverse brake 52 is actuated so that carriage 20 will not be able to move relative to support 12. With carriage 20 locked into position, further rotation of the belt 28 by the motor 22 will simply cause the rotation of pulley 48 in one direction or the other depending upon the direction of rotation of the motor 22.
If it is desired to vertically move support 70 relative to carriage 58, vertical brake 80 is released so that movement of the belt 50 in either direction depending upon the direction of rotation of the motor 22, will cause the support 70 to either move upwardly or downwardly relative to carriage 58. During such movement, the horizontal brake 84 would be engaged.
When it is desired to move the carriage 58 horizontally relatively to support 56, vertical brake 80 is engaged and horizontal brake 84 is disengaged so that movement of the belt 50 in one direction or another depending upon the direction of movement of the motor 22 will cause the carriage 58 to move inwardly or outwardly on the support 56.
A stationary position is held with the anchor brake 82, horizontal brake 84, vertical brake 80 and traverse brake 52 being engaged with the drive motor 22 being held in its holding position. To summarize somewhat, vertical motion of the support 70 is attained by releasing the vertical brake 80 with the drive motor 22 moving the support 70 to the desired position. Horizontal motion of the carriage 58 is attained by releasing the horizontal brake 84 with the drive motor 22 moving the carriage 58 to the desired position. Traverse motion is attained by releasing the traverse brake 52 and the drive motor 22 moving the carriage 20 to the desired position. It should be noted that the structure shown in FIG. 4 in cross-section depicts the side structure for the carriage 12 to cooperate with the brake 52. The side structure and brake 52 are not shown in FIG. 1 to provide a clear view of the drive structure.
Thus it can be seen that a unique three-axis Cartesian arm-type robot has been provided which is driven by a single motor through a unique support, carriage and brake mechanism. The robot of this invention is less costly to manufacture and is much more reliable in operation. Further, the robot of this invention is simplified in construction. Thus it can be seen that the invention accomplishes at least all of its stated objectives.
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|U.S. Classification||414/749.1, 901/26, 74/490.04, 901/21, 901/16|
|International Classification||B25J9/02, B25J9/10|
|Cooperative Classification||B25J9/104, Y10T74/20323, B25J9/023|
|European Classification||B25J9/02B, B25J9/10C|
|Jul 13, 1999||REMI||Maintenance fee reminder mailed|
|Oct 21, 1999||FPAY||Fee payment|
Year of fee payment: 4
|Oct 21, 1999||SULP||Surcharge for late payment|
|Jul 9, 2003||REMI||Maintenance fee reminder mailed|
|Dec 19, 2003||LAPS||Lapse for failure to pay maintenance fees|
|Feb 17, 2004||FP||Expired due to failure to pay maintenance fee|
Effective date: 20031219